Massachusetts Energy Code Help — Base, Stretch & Specialized Code (2026)
Plain-English help meeting the Massachusetts residential energy code, from a certified HERS rater. Find your city’s exact code status and requirements below.
Codes3 tiers
New-home HERS≤42–48
Blower door≤3.0 ACH50
Duct leakage≤4 CFM25
The Three Massachusetts Energy Codes
Every Massachusetts community is on one of three residential energy codes. Use the city directory below to see which applies to your project.
Base Code
- Statewide minimum (IECC 2021)
- No Stretch/Specialized HERS targets
- Blower door & duct testing still required
Stretch Code
- 225 CMR 22.00 — most towns
- New homes HERS-rated to target
- Higher performance than base
Specialized Code
- Net-zero-ready appendix
- Pre-wiring, solar-ready, all-electric
- The most demanding tier
HERS, Blower Door & Duct Testing
Under the Stretch and Specialized codes, new homes must earn a verified HERS Index and pass a blower door test (≤3.0 ACH50) and duct leakage test (≤4 CFM25 / 100 sq ft). We handle all three, documented for your building department.
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Energy Code Help by City — Massachusetts
Select your city for its exact code status (Base, Stretch, or Specialized) and full requirements:
- Acton
- Acushnet
- Adams
- Agawam
- Alford
- Amesbury
- Amherst
- Andover
- Aquinnah
- Arlington
- Ashburnham
- Ashby
- Ashfield
- Ashland
- Athol
- Attleboro
- Auburn
- Avon
- Ayer
- Barnstable
- Barre
- Becket
- Bedford
- Belchertown
- Bellingham
- Belmont
- Berkley
- Berlin
- Bernardston
- Beverly
- Billerica
- Blackstone
- Blandford
- Bolton
- Boston
- Bourne
- Boxborough
- Boxford
- Boylston
- Braintree
- Brewster
- Bridgewater
- Brimfield
- Brockton
- Brookfield
- Brookline
- Buckland
- Burlington
- Cambridge
- Canton
- Carlisle
- Carver
- Charlemont
- Charlton
- Chatham
- Chelmsford
- Chelsea
- Cheshire
- Chester
- Chesterfield
- Chicopee
- Chilmark
- Clarksburg
- Clinton
- Cohasset
- Colrain
- Concord
- Conway
- Cummington
- Dalton
- Danvers
- Dartmouth
- Dedham
- Deerfield
- Dennis
- Dighton
- Douglas
- Dover
- Dracut
- Dudley
- Dunstable
- Duxbury
- East Bridgewater
- East Brookfield
- East Longmeadow
- Eastham
- Easthampton
- Easton
- Edgartown
- Egremont
- Erving
- Essex
- Everett
- Fairhaven
- Fall River
- Falmouth
- Fitchburg
- Florida
- Foxborough
- Framingham
- Franklin
- Freetown
- Gardner
- Georgetown
- Gill
- Gloucester
- Goshen
- Gosnold
- Grafton
- Granby
- Granville
- Great Barrington
- Greenfield
- Groton
- Groveland
- Hadley
- Halifax
- Hamilton
- Hampden
- Hancock
- Hanover
- Hanson
- Hardwick
- Harvard
- Harwich
- Hatfield
- Haverhill
- Hawley
- Heath
- Hingham
- Hinsdale
- Holbrook
- Holden
- Holland
- Holliston
- Holyoke
- Hopedale
- Hopkinton
- Hubbardston
- Hudson
- Hull
- Huntington
- Ipswich
- Kingston
- Lakeville
- Lancaster
- Lanesborough
- Lawrence
- Lee
- Leicester
- Lenox
- Leominster
- Leverett
- Lexington
- Leyden
- Lincoln
- Littleton
- Longmeadow
- Lowell
- Ludlow
- Lunenburg
- Lynn
- Lynnfield
- Malden
- Manchester By The Sea
- Mansfield
- Marblehead
- Marion
- Marlborough
- Marshfield
- Mashpee
- Mattapoisett
- Maynard
- Medfield
- Medford
- Medway
- Melrose
- Mendon
- Merrimac
- Methuen
- Middleborough
- Middlefield
- Middleton
- Milford
- Millbury
- Millis
- Millville
- Milton
- Monroe
- Monson
- Montague
- Monterey
- Montgomery
- Mount Washington
- Nahant
- Nantucket
- Natick
- Needham
- New Ashford
- New Bedford
- New Braintree
- New Marlborough
- New Salem
- Newbury
- Newburyport
- Newton
- Norfolk
- North Adams
- North Andover
- North Attleborough
- North Brookfield
- North Reading
- Northampton
- Northborough
- Northbridge
- Northfield
- Norton
- Norwell
- Norwood
- Oak Bluffs
- Oakham
- Orange
- Orleans
- Otis
- Oxford
- Palmer
- Paxton
- Peabody
- Pelham
- Pembroke
- Pepperell
- Peru
- Petersham
- Phillipston
- Pittsfield
- Plainfield
- Plainville
- Plymouth
- Plympton
- Princeton
- Provincetown
- Quincy
- Randolph
- Raynham
- Reading
- Rehoboth
- Revere
- Richmond
- Rochester
- Rockland
- Rockport
- Rowe
- Rowley
- Royalston
- Russell
- Rutland
- Salem
- Salisbury
- Sandisfield
- Sandwich
- Saugus
- Savoy
- Scituate
- Seekonk
- Sharon
- Sheffield
- Shelburne
- Sherborn
- Shirley
- Shrewsbury
- Shutesbury
- Somerset
- Somerville
- South Hadley
- Southampton
- Southborough
- Southbridge
- Southwick
- Spencer
- Springfield
- Sterling
- Stockbridge
- Stoneham
- Stoughton
- Stow
- Sturbridge
- Sudbury
- Sunderland
- Sutton
- Swampscott
- Swansea
- Taunton
- Templeton
- Tewksbury
- Tisbury
- Tolland
- Topsfield
- Townsend
- Truro
- Tyngsborough
- Tyringham
- Upton
- Uxbridge
- Wakefield
- Wales
- Walpole
- Waltham
- Ware
- Wareham
- Warren
- Warwick
- Washington
- Watertown
- Wayland
- Webster
- Wellesley
- Wellfleet
- Wendell
- Wenham
- West Boylston
- West Bridgewater
- West Brookfield
- West Newbury
- West Springfield
- West Stockbridge
- West Tisbury
- Westborough
- Westfield
- Westford
- Westhampton
- Westminster
- Weston
- Westport
- Westwood
- Weymouth
- Whately
- Whitman
- Wilbraham
- Williamsburg
- Williamstown
- Wilmington
- Winchendon
- Winchester
- Windsor
- Winthrop
- Woburn
- Worcester
- Worthington
- Wrentham
- Yarmouth